Rangers setup man Mike Adams has struggled in September, allowing seven earned runs on 14 hits over just 8 1/3 innings. And now there’s a valid reason for those uncharacteristically poor results.

According to beat writer Anthony Andro of FOX Sports Southwest, the right-hander was diagnosed this weekend with thoracic outlet syndrome — a condition that causes pain in the neck and shoulder and can affect a pitcher’s ability to grip a baseball.

Cardinals starter Chris Carpenter was issued the same diagnosis earlier this year and had to get a rib removed to curb the symptoms. He’s back in action now but missed the first five months of the season.

Adams will be shut down for the next 7-10 days. He’s hoping to pitch in the playoffs, but that seems doubtful.

Sometimes rest and anti-inflammatory medication can alleviate the symptoms. The condition can not only be painful but also affect grip and how the ball feels in the hand, both obviously directly affecting control for a pitcher. Wish him the best.